The recessive gene that always produces its effect is:

Which of the following organisms exhibits a sex determination mechanism similar to that of humans?

The initial experiments for the genetic basis of sex determination were performed on $........$.

In which of the following is the male monosomic $(XO)$?

Assertion : In humans,the gamete contributed by the male determines whether the child produced will be male or female.
Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on $X-$ chromosome and some on $Y-$ chromosome.

Which of the following conditions of gametes results in the birth of a normal human female child?